Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/17770#discussion_r113633693 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala --- @@ -203,7 +204,7 @@ class Dataset[T] private[sql]( * custom objects, e.g. collect. Here we resolve and bind the encoder so that we can call its * `fromRow` method later. */ - private val boundEnc = + private lazy val boundEnc = --- End diff -- We can't let `boundEnc` as lazy val because we need early exception when the encoder can't be resolved.
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